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(No Model.) 2 She'etsSheet 1. C. HAMANN & J. 'A. SCHMIDT.

SHEARS.

No. 476,459. Patented June 7, 1892.

2 SheetsSheet 2.

(No Model.)

Patented June 7, 1892;

/ l I l ue nlnqs K U'U W I NITE STATES PATENT OFFICE.

CARL HAMANN, OF REINBECK, AND JACOB ALBERT SCHMIDT, OF BARMEN, GERMANY.

SHEARS.

SPECIFICATION forming part of Letters Patent No. 476,459, dated June 7,1892. Application filed April 22, 1892. Serial No. 430,173. (No model.)

To (ZZZ whom it may concern.-

Be it known that-we, CARL HAMANN, of Reinbeck, and JACOB ALBERT SCHMIDT,of Barmen, both in the Empire of Germany, have invented a new and usefulImprovement in Shears, Nippers, and the Like, of which the following isa specification.

This invention relates to shears, nippers, and similar tools in whichtwo blades or jaws I are approached to each other by the compressiontogether of the handles; and the object of the invention is to so causethe movement of the handles to operate the blades or jaws that a greatpower or leverage may be attainable in the cutting or nipping action ofthe tool. Such improved tools will therefore be especially suitable forcutting or working hard materials, such as metal. The presentimprovement effects this end by permitting or causing the movement ofthe handles toward each other to be greater in proportion to themovement of approach of the blades (under which term is hereinafterincluded the jaws or other operative faces of the tool,

2 5 whether sharp or otherwise) than is the case with tools in which thehandles are each in one part with the respective blades.

In the accompanying drawings, Figure 1 is a side view of improvedmetal-cutting shears 0 as shown partly open. Fig. 2 is an edge viewthereof. Fig. 3 shows the same closed. Fig. i is a detail view of one ofthe blades. Figs. 5 and 6 are respectively open and closed aspects of apair of wire-'nippers made accord- 5 ing to this invention. Figs. 7 and8 are respectively open and closed aspects of another pair of improvedwire nippers of greater strength than those in Figs. 5 and 6. Fig. 9 isa side view of tailors shears.

The blades A B, which are pivoted one on the other by a pin or bolt 0,have each an extension handleward from the pivot m m, to whichextensions the handles G G are respectively pivoted by bolts 0 0'. Thesehandles 5 have each teeth .2, which mesh with corre sponding teeth a onthat blade A or B to which the respective handle is not pivoted.

This construction causes the movement of the handles relatively to theblades to be greater than would be the case if the handles were solidwith the respective blades.

In Fig. 3 the dotted position of the handle G is equivalent to theclosed position of the blades if the handle were fixed with the blade inthe position in Fig. 1. The difference indicated by the are at, Fig. 3,is therefore the gain of movement each handle acquires by thisinvention.

In Figs. 5 and 6 rounded teeth are shown instead of the usual-shapedteeth in Fig. 1. p

In all other and essential respects the construction is thesame.

In Figs. 7 and 8 the nippers shown are of greater power, since thepitch-radius of the teeth .2 is much less than that of the teeth a. Thistool will require to be worked with two hands.

In Fig. 9 the tailors shears are made on the same principle. One of thebladesthe lower onehas, however, also a rearward extension 7.5, whichrests on the table, &c., on which the cutting is done and keeps theshears upright, serving as a stand or base-plate for them.

Having now described our invention, what we claim as new, and desire tosecure by Let- 7 5 ters Patent, is

Shears, nippers, or equivalent hand-tools in which the two correspondingblades, jaws, or faces are pivoted one on the other and pro-v vided withextensions on which are respect- 8o ively pivoted handles having teethgearing each with the blade, jaw, or face other than that to theextension of which the respective handle is pivoted.

In witness whereof we have hereunto set our hands in presence of twowitnesses.

CARL HAMANN. JACOB ALBERT SCHMIDT.

Witnesses:

ALFRED FUoHss,

Clerk at Bcmnen, 19 Raucnwerih. RICHARD CLEMENS,

Clerk at Barman, Hochstr. 4

